The ZAGGsparq is a portable power supply about the size of an Airport Express that can charge up to two USB devices at a time and hold enough juice for up to four full iPhone charges.

To use the ZAGGsparq, you just plug it into the wall to store up a charge of its own. Then when you've got a USB device that needs charging (think your phone or MP3 player), just plug it into ZAGGsparq and get charging.

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I just got this small instant power charger over the holidays and I already love it, though it can only handle about one iPhone charge. It's also only $19, compared to ZAGGsparq's $100 price tag, so that's something worth considering. Whether you go the cheap or the spendy route, portable chargers seem to be getting cheaper by the day, and they can provide a great boost for your gear when you're on-the-go.